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A Case Study of a Low Overburden Longwall Recovery with Pre-Developed Recovery Entries

机译：带有预先开发的回收条目的低覆盖层长壁回收的案例研究

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The 3 Right pre-developed longwall recovery entry at Signal Peak Energy's Bull Mountain No. 1 mine was designed to prevent the abnormal roof conditions encountered in its first two recovery entries. Unique geological conditions, such as the low overburden of approximately 200 feet and prevalence of roof joints in the sandstone overburden, contribute significantly to abnormal conditions during longwall recovery. The 3 Right recovery entry was 42 ft wide and developed in two stages, 21 ft wide in each stage. The entry roof was reinforced with steel wire meshon-metallic recovery mesh, high-capacity primary bolts and cables. After all the support was installed, the entry was completely backfilled with specially designed, cuttable, low-density cement. The roof bolting and backfill design were based on current practices in this mine and successful practices in other mines in the U.S. and Australia. Extensive instrumentation was installed in the recovery entry for continuous monitoring of load transfer as the face approached and cut into the recovery entries. The support design was completely successful with a smooth cut-through on January 29 and 30, 2014, significantly reducing the shield recovery time and meanwhile protecting the safety of miners. Based on actual observance and practices of the 3 Right recovery entry, recommendations on improvement and modifications of roof support for 4 Right recovery room are presented.
机译：在Signal Peak Energy的Bull Mountain No. 1矿山中的3 Right预开发的长壁回收口旨在防止其前两个回收口遇到异常的顶板情况。独特的地质条件，例如大约200英尺的低覆盖层以及砂岩覆盖层中的屋顶缝普遍存在，在长壁采收过程中是异常条件的重要原因。 3右侧恢复入口宽42英尺，分两个阶段开发，每个阶段21英尺宽。入口屋顶用钢丝网/非金属回收网，大容量初级螺栓和电缆加固。安装完所有支撑后，入口将完全重新填充特殊设计的可切割低密度水泥。顶板锚固和回填设计基于该矿场的现行做法以及美国和澳大利亚其他矿场的成功做法。在恢复入口中安装了广泛的仪表，以便在工作面接近并切入恢复入口时对负载转移进行连续监控。支撑设计在2014年1月29日至30日顺利完成，取得了圆满成功，大大缩短了防护罩的恢复时间，同时保护了矿工的安全。根据3 Right Recovery入口的实际观察和实践，提出了有关4 Right Recovery房间的屋顶支撑的改进和修改的建议。

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